package com.pivotal.hawq.mapreduce;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */


/**
 * A <code>DataProvider</code> provides test data for <code>HAWQTable</code>
 */
public interface DataProvider {

	public static final DataProvider EMPTY = new EmptyDataProvider();
	public static final DataProvider ENUMERATE = new EnumerateDataProvider();
	public static final DataProvider RANDOM = new RandomDataProvider();


	/**
	 * Generate test data for the given HAWQ table, return
	 * insertion SQLs to populate the data.
	 * @param table definition for a HAWQ table
	 * @return insertion SQLs to populate test data for specified table.
	 */
	String getInsertSQLs(HAWQTable table);
}
